Cisco Wireless :: 3502s / Mixing AP Models - DHCP Versus DNS For Controller Discovery

I'm adding some additional AP's (3502s) to an environment that is all 1131AG AP's.  The DHCP is configured for DHCP option 43 for remote sites for layer 3 discovery.  Since only one AP mode can use option 43, I've added a DNS entry for cisco-lwapp-controller in my local domain.My assumption here is that the new 3502's will be able to use DNS for discovery, while any additional 1131AG would continue to use DHCP option 43. will this work in a mixed environment?The new AP briefly showed up on my controller, but then disappeared.  The LED is cycling red, green, off - indicating it is still in the discovery process. Could I effectively remove the option 43 in DHCP and have all AP's use DNS?  Is this as reliable as option 43?  What is the best practice for discovery?